Add rate limit cache and fixes

This change adds a loop that keeps a cache of credentials rate limits
as reported by the github API. The cache is updated every 30 seconds
and is purely informational for the user.

This change also adds some caching improvements. Functions that return
values from the cache as lists, will now sort by ID or creation date.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

cache/credentials_cache.go

@@ -21,6 +21,16 @@ type GithubCredentials struct {
 	cache map[uint]params.GithubCredentials
 }
 
+func (g *GithubCredentials) SetCredentialsRateLimit(credsID uint, rateLimit params.GithubRateLimit) {
+	g.mux.Lock()
+	defer g.mux.Unlock()
+
+	if creds, ok := g.cache[credsID]; ok {
+		creds.RateLimit = rateLimit
+		g.cache[credsID] = creds
+	}
+}
+
 func (g *GithubCredentials) SetCredentials(credentials params.GithubCredentials) {
 	g.mux.Lock()
 	defer g.mux.Unlock()
@@ -54,6 +64,21 @@ func (g *GithubCredentials) GetAllCredentials() []params.GithubCredentials {
 	for _, cred := range g.cache {
 		creds = append(creds, cred)
 	}
+
+	// Sort the credentials by ID
+	sortByID(creds)
+	return creds
+}
+
+func (g *GithubCredentials) GetAllCredentialsAsMap() map[uint]params.GithubCredentials {
+	g.mux.Lock()
+	defer g.mux.Unlock()
+
+	creds := make(map[uint]params.GithubCredentials, len(g.cache))
+	for id, cred := range g.cache {
+		creds[id] = cred
+	}
+
 	return creds
 }
 
@@ -72,3 +97,11 @@ func DeleteGithubCredentials(id uint) {
 func GetAllGithubCredentials() []params.GithubCredentials {
 	return credentialsCache.GetAllCredentials()
 }
+
+func SetCredentialsRateLimit(credsID uint, rateLimit params.GithubRateLimit) {
+	credentialsCache.SetCredentialsRateLimit(credsID, rateLimit)
+}
+
+func GetAllGithubCredentialsAsMap() map[uint]params.GithubCredentials {
+	return credentialsCache.GetAllCredentialsAsMap()
+}